Family name Siima (Siima 
) , throughout the world, is quite a rare last name. The family name Siima is characteristic of Tanzania, where it is quite a rare surname, Uganda, where it is a rare surname, and Estonia. Not in comparison with a country's population, it is the most numerous in Sub-Saharan Africa, particularly Tanzania, Uganda, and South Africa. Likewise, Siima is the forename as well as the last name.